Roller tooth profile of work roll for roll forming of flow channel of metal bipolar plate and parametric design method thereof

A roller tooth profile of a work roll for roll forming of a flow channel of a metal bipolar plate, wherein the work roll comprises an upper roller and a lower roller, and each of the upper roller and the lower roller comprises a plurality of teeth and a plurality of grooves;

• and the roller tooth profile is determined based on flow channel depth h and a rolling period, wherein h=r1−r6;
• the rolling period is determined by a period angle φ which is an angle between center lines of two adjacent teeth;
• r1 is a radius of a tooth top circle of the upper roller;
• and r6 is a radius of a tooth root circle of the upper roller;
• a roller tooth profile diagram is plotted according to the flow channel depth h and the rolling period;
• a first-half surface of a tooth of the upper roller consists of a tooth top surface segment AB, a tooth top angle segment BC, a tooth-side upper half segment CD, a tooth-side lower half segment DE, a tooth root angle segment EF, and a tooth root segment FG;
• wherein the segment AB is taken from a first circle with a center O1 of the upper roller as center and the radius r1 as radius;
• the segment CD is taken from a second circle with a center O3 of an adjacent tooth as center and r3 as radius, wherein r3 is a distance from the center O3 to a tooth-side point of the tooth corresponding to the segment AB;
• the segment BC is an arc transition segment tangent to points B and C and with O2 as center;
• the segment DE is a straight segment tangent to point D;
• the segment FG is an arc segment with O1 as center and the radius r6 as radius;
• and the segment EF is an arc segment tangent to points E and F and with O5 as center;
• and
• the first-half surface of the tooth is the same as second-half surface of the tooth in shape, and symmetrical with the second-half teeth of the tooth;
• and the upper roller is the same as the lower roller in roller tooth profile.